Abstract: A sleeping bag (2) includes an outer shell (4), an inner liner (6) and a plurality of longitudinally extending insulating batts (24) therebetween secured along their longitudinal edges (20, 22) to the shell and to the liner in an overlapping, shingled arrangement. The circumferential dimension of the liner can be reduced by connecting spaced apart zipper elements (50, 52) fastened to the liner, thus causing an increased overlap of the batts resulting in increased thermal insulation. A cord casing (60) at the head hole (16) is secured to the liner along a line (64) spaced apart from the seam (66) joining the shell and the liner at the head hole so that when the draw string (68) is pulled taut, creasing and other deformation of the shell surrounding the head hole is minimized so to reduce any decrease in thermal insulation. The head and foot of the bag define three dimensional cavities sized to generally conform to the user's head and feet to minimize compression of the bag.